我想插入一个UITextField的文本。
这可能吗?
我想插入一个UITextField的文本。
这可能吗?
当前回答
我通常尽量避免子类化,但如果你已经:
// add a property
@property (nonatomic) UIEdgeInsets edgeInsets;
// and override:
- (CGRect)textRectForBounds:(CGRect)bounds
{
return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}
- (CGRect)editingRectForBounds:(CGRect)bounds
{
return [super editingRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}
其他回答
这是我发现的最快的方法,不需要做任何子类:
UIView *spacerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10., 10.)];
[textField setLeftViewMode:UITextFieldViewModeAlways];
[textField setLeftView:spacerView];
迅速:
let spacerView = UIView(frame:CGRect(x:0, y:0, width:10, height:10))
textField.leftViewMode = UITextFieldViewMode.Always
textField.leftView = spacerView
你可以通过设置leftView来设置UITextField的文本插入。
是这样的:
UITextField *yourTextField = [[UITextField alloc] init];
UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 5)];
leftView.backgroundColor = [UIColor clearColor];
yourTextField.leftViewMode = UITextFieldViewModeAlways;
yourTextField.leftView = leftView;
抛出另一个不需要子类化的解决方案:
UITextField *txtField = [UITextField new];
txtField.borderStyle = UITextBorderStyleRoundedRect;
// grab BG layer
CALayer *bgLayer = txtField.layer.sublayers.lastObject;
bgLayer.opacity = 0.f;
// add new bg view
UIView *bgView = [UIView new];
bgView.backgroundColor = [UIColor whiteColor];
bgView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
bgView.userInteractionEnabled = NO;
[txtField addSubview: bgView];
[txtField sendSubviewToBack: bgView];
在iOS 7和iOS 8上测试。这两个工作。苹果仍然有可能修改UITextField的层层次结构,把事情搞砸了。
我子类化UITextField来处理这个,它支持左,上,右和底部的插入,以及清除按钮的定位。
MRDInsetTextField.h
#import <UIKit/UIKit.h>
@interface MRDInsetTextField : UITextField
@property (nonatomic, assign) CGRect inset;
@end
MRDInsetTextField.m
#import "MRDInsetTextField.h"
@implementation MRDInsetTextField
- (id)init
{
self = [super init];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (void)setInset:(CGRect)inset {
_inset = inset;
[self setNeedsLayout];
}
- (CGRect)getRectForBounds:(CGRect)bounds withInset:(CGRect)inset {
CGRect newRect = CGRectMake(
bounds.origin.x + inset.origin.x,
bounds.origin.y + inset.origin.y,
bounds.origin.x + bounds.size.width - inset.origin.x - inset.size.width,
bounds.origin.y + bounds.size.height - inset.origin.y - inset.size.height
);
return newRect;
}
- (CGRect)textRectForBounds:(CGRect)bounds {
return [self getRectForBounds:[super textRectForBounds:bounds] withInset:_inset];
}
- (CGRect)placeholderRectForBounds:(CGRect)bounds {
return [self getRectForBounds:bounds withInset:_inset];
}
- (CGRect)editingRectForBounds:(CGRect)bounds {
return [self getRectForBounds:[super editingRectForBounds:bounds] withInset:_inset];
}
- (CGRect)clearButtonRectForBounds:(CGRect)bounds {
return CGRectOffset([super clearButtonRectForBounds:bounds], -_inset.size.width, _inset.origin.y/2 - _inset.size.height/2);
}
@end
*_someTextField*来自nib/storyboard视图,带有MRDInsetTextField自定义类的用法示例
[(MRDInsetTextField*)_someTextField setInset:CGRectMake(5, 0, 5, 0)]; // left, top, right, bottom inset
如果你有一个明确的按钮,接受的答案将不适合你。我们还应该警惕苹果在未来通过调用super来改变事情。
因此,为了确保文本不会与清除按钮重叠,让我们先从super中获取“默认”值,然后根据需要进行调整。
这段代码将在文本框的顶部、左侧和底部添加一个10px的insets:
@interface InsetTextField : UITextField
@end
@implementation InsetTextField
// Placeholder position
- (CGRect)textRectForBounds:(CGRect)bounds {
CGRect rect = [super textRectForBounds:bounds];
UIEdgeInsets insets = UIEdgeInsetsMake(10, 10, 10, 0);
return UIEdgeInsetsInsetRect(rect, insets);
}
// Text position
- (CGRect)editingRectForBounds:(CGRect)bounds {
CGRect rect = [super editingRectForBounds:bounds];
UIEdgeInsets insets = UIEdgeInsetsMake(10, 10, 10, 0);
return UIEdgeInsetsInsetRect(rect, insets);
}
// Clear button position
- (CGRect)clearButtonRectForBounds:(CGRect)bounds {
CGRect rect = [super clearButtonRectForBounds:bounds];
return CGRectOffset(rect, -5, 0);
}
@end
注意:UIEdgeInsetsMake接受参数的顺序是:上,左,下,右。